Javascript prototype, help please?

Question

So I messed this up on the test so Im here looking for help.

I want to create a prototype that buys stockshares with the following instructions/functionality.

stock name, amount, price per share.

the value should be with a method that has a parameter with the current price and then return how much the price had increased or decreased sincd the the first

Answer 1

Share your attempts, i try to find the solution from there on.